package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    // 新增
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (!flavors.isEmpty()) {
            flavors.forEach(flavor -> flavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        try {
            PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
            Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
            return new PageResult(page.getTotal(),page.getResult());
        } finally {
            PageHelper.clearPage();
        }

    }

    @Transactional
    public void deleteBatch(List<Long> ids) {

        // 起售中得菜品不能删除
        if (dishMapper.countByStatus(ids, StatusConstant.ENABLE)>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
        }
        // 已关联套餐的菜品不能删除
        if (setmealDishMapper.countByDishIds(ids)>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    public DishVO getByIdWithFlavor(Long id) {
        Dish dish = dishMapper.getById(id);
        List<DishFlavor> dishFlavors= dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    // 修改
    @Transactional
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        Long dishId = dish.getId();
        List<Long> ids = new ArrayList<>();
        ids.add(dishId);
        dishFlavorMapper.deleteByDishIds(ids);

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (!flavors.isEmpty()) {
            flavors.forEach(flavor -> flavor.setDishId(dishId));
            dishFlavorMapper.insertBatch(flavors);
        }
    }
}
